cairo是一个免费的矢量绘图软件库，它可以绘制多种输出格式。

Cairo is a free software vector drawing library that can draw to multiple output formats.

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使用二次方和三次方的贝塞尔曲线是相当有挑战的，因为不像在矢量绘图软件Adobe Illustrator里那样有即时的视觉反馈。

Using quadratic and cubic bezier curves can be quite challenging, because unlike vector drawing software like Adobe Illustrator, we don't have direct visual feedback as to what we're doing.

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